为实现低起振阈值、高斜率效率的短腔窄线宽随机激光输出,提出一种基于随机分布光栅阵列的窄线宽随机光纤激光器。基于随机分布光栅阵列的随机光栅可有效提升随机光纤激光器的起振阈值与泵浦功率。在满足光局域化的前提下,利用随机光纤光栅超窄反射峰搭建超窄线宽随机光纤激光器,该激光器实现了1.33 kHz的窄线宽随机激光输出,起振阈值为24.5 mW,斜率效率约为10%,且激光输出功率与中心波长处于稳定状态。与其他激光器相比,所提激光器具有更低的起振阈值、更高的斜率效率、更短的腔长及相对简单的结构,有望在光通信、高功率窄线宽光纤激光器、光纤传感等领域得到进一步应用。

In this paper, we propose a narrow-linewidth random fiber laser based on random distributed grating array to achieve a short cavity length and narrow-linewidth random laser with low pump threshold and high slope efficiency. The random grating based on randomly distributed grating array can effectively improve the pump threshold and pump power of the random fiber laser. Based on the localization theory of light, a narrow-linewidth random fiber laser is constructed with the ultra-narrow relfection peak of the random fiber grating. The laser can generate a stable narrow linewidth random laser output of 1.33 kHz, the pump threshold is approximately 24.5 mW, and the slope efficiency is approximately 10%. Moreover, the central wavelength and laser output power remain stable. Compared with other lasers, the proposed laser has a lower pump threshold, higher slope efficiency, shorter cavity length, and relatively simpler structure. Accordingly, the proposed laser can potentially be applied in several applications, including optical communication, narrow-linewidth high power fiber lasers, and fiber sensors.